386931891 has 8 divisors (see below), whose sum is σ = 533699280. Its totient is φ = 249059552.

The previous prime is 386931877. The next prime is 386931893. The reversal of 386931891 is 198139683.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 386931891 - 2⁵ = 386931859 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 386931891.

It is not an unprimeable number, because it can be changed into a prime (386931893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2223660 + ... + 2223833.

It is an arithmetic number, because the mean of its divisors is an integer number (66712410).

Almost surely, 2^386931891 is an apocalyptic number.

386931891 is a deficient number, since it is larger than the sum of its proper divisors (146767389).

386931891 is a wasteful number, since it uses less digits than its factorization.

386931891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4447525.

The product of its digits is 279936, while the sum is 48.

The square root of 386931891 is about 19670.5844092137. The cubic root of 386931891 is about 728.6934099655.

The spelling of 386931891 in words is "three hundred eighty-six million, nine hundred thirty-one thousand, eight hundred ninety-one".